Saw-set.



@mi Muzeau PATENTED SEPT. T9, 1905.

H. L. JOHNSTON.

SAW SET.

APPLICATION FILED PEB. 28,1905.,

2 SHEETS-SHEET 1.

. PATENTED SEPT. 19, 1905. H. L. JOHNSTON.

SAW SET.

APPLIGA'TON FILED Iii-113.28, 1905.

2 SHEETS-SHEET 2.

Hfyl. @727252073 UNTTED sTATEs PATENT OEEIOE.

HARRY L. JOHNSTON, vOF DETROIT, MINNESOTA.

SAW-SET.

To all whom t Wawy concern:

Be it known that I, HARRY L. JOHNSTON, a citizen of the United States,residing at Detroit, in the county of Becker and State of Minnesota,have invented certain new and useful Improvements in Saw-Sets, of whichthe following is a specification.

This invention aims to provide a simple and durable saw-setting tool,and embodies a construction of device of this class which isparticularly adapted for use in setting teeth of crosscut, buck, orother saws.

to the following description and accompanyl tion.

An essential feature of the invention resides in the provision ofpeculiar means for admitting of use of the device in setting teeth ofdifferent lengths, a special form of gage means being utilized for thispurpose. In addition to the above peculiar means are also used forregulating the pitch or set of the teeth, so that all teeth of the sawwill be accurately alined when the operation isv completed.

For a full description of the invention and the merits thereof and alsoto acquire a knowledge of the details of construction of the means fore'ecting the result reference is to be had ing drawings.

While the invention may be adapted to different forms and conditions bychanges in the structure and minor details without departing from thespirit or essential features thereof, still the preferred embodimentthereof is shown in the accompanying drawings, in which;

Figure 1 is a perspective view of a tool embodying the essentialfeatures of the inven- Fig. 2 is a vertical longitudinal sectional view.Fig. 3 is aside elevation. Fig.

' 4 is a sectional View taken about on the line 4 4 of Fig. 2. Fig. 5 isa broken section taken about on the line 5 5 of Fig. 2. Fig. 6 is adetail perspective view of the pressure member. Fig. 7 is a detailperspective view of the gage-plate and the means adjustably attachingthe same.

In carrying out the invention and specifically describing theconstruction. thereof the tool comprises a handle 1, at one end of whichis disposed a relatively rigid jaw 2. A second handle 3 is pivoted tothe jaw 2 at 4, and this handle cooperates with a movable jaw 5, whichis mounted for movement longitudinally of the handle l. The end portionof the-handle 1 adjacent the jaw 2 is preferably of bifurcateconstruction to form spaced members 1, and the movable jaw 5 is providedwith openings Specification of Letters Patent. Application filedFebruary 28, 1905. Serial No. 24=;7,'734l Patented Sept. 19, 1905.

therethrough, which openings receive the spaced members 1". Between thejaw 5 and the jaw 2 and mounted upon the spaced members 1t1 of thehandle l are interposed coilsprings 6, the normal action of which is tohold the two jaws 1 and 5 separated. The end portion'of the handle 3adjacent the jaw 2 is likewise bifurcated to form spaced membersa, andthese members operate upon opposite sides of the jaws 2 and 5, thepivot4 passing through both of the members 3, as shown most clearlyinthe drawings. Some distance from the pivot 4 the members 3a ofthehandle 3 are connected by a transverse bar 7, which is adapted toengage a cam 8, formed upon the rear portion of the movable jaw 5. Thecam 8 inclines outwardly toward the handle i, and by forcing the handle3 toward the'handle 1 the bar 7 in riding up the cam 8 forces themovable jaw toward the fixed jaw. In operating the tool the teeth of thesaw are received between the jaws 2 and 5, and said jaws are closed uponthe teeth individually, whereupon' the tool is operated to set or givethe proper pitch to the said teeth.

In order that the device may be applied tol teeth of dierent lengths andoffset all of the teeth at the same depth or length, a gageplate 9 isutilized, and this plate is preferably mounted at one side of themovable jaw 5.l

The plate 9 is slotted longitudinally, as shown at 10, and a set-sdrew11 passes through the lslot 10 of the plate, a thumb-nut 12 beingthreaded upon the screw 1l and adapted to engage the plate 9 in order tohold the latter at an' ascertained` adjustment. An end portion oftheplate 9 is projected outwardly from the jaw 5 to form a finger-piece-13, and the opposite end portion is projected laterally and downwardlyto form a somewhat U-shaped gage member 14, which receives and rests incontact with the inner or working side of the jaw 5 above mentioned. Itwill be obvious that the member 14 comprises a projecting part whichwill regulate the length of the tooth which may be received between thejaws 2 and 5 by engaging or resting against the extremity of each tooth.By adjustment of the plate 9 longitudinally of the jaw 5 the portion ofthe tooth embraced bythe jaws of the device will be varied according tothe desires of the operator, as necessary for the purposes of theinvention.

At the end of the jaw 2 opposite that which operates upon the teeth ofthe saw is mounted a feed-screw 15, said screw being arranged IOO IIO

longitudinally of the tool and provided at one end with a suitableknurled linger-piece 16 by which it is manipulated. The portion of thejaw 2 at which the screw 15 is mounted is recessed, as at 17, from oneside of the jaw, and the screw aforesaid is mounted in openings in theend walls of this recess 17 An indicating member 18 is provided with athreaded opening therethrough t0 receive the screw 15 and is adjustedbetween the end walls of the recess 17 by means of said screw. Betweenthe member 18 and one end wall of the recess 17 is interposed acoil-spring 19, and this spring is mounted upon the feed-screw abovedescribed. The member 18 coperates with a pressure device or member 20,which comprises, essentially, a plate pivoted at a point between itsends to a side of the jaw 2, one end of the plate being projected somedistance beyond the working end of the jaw 2, the opposite end of thepressure member having a projection 21 extended laterally therefromadjacent the recess 17 above described. The member 2O is adapted forpivotal movement in the plane of the side ofthe tool and is designed tocoperate with the saw, so that the exact amount of movement of the toolin setting the teeth may be determined. A side of the jaw 2 is providedwith a second recess 22 just below the recess 17, and the coilspring 23,mounted in this recess, bears against the lug 24, projecting laterallyfrom the member 2O near its upper end. A U-shaped guide member 25 hasthe ends thereof received in the recess 22, and this guide member 25receives the pressure member 2() and directs said member in itsmovement. The side wall of the recess 17 at its outer edge may benotched, as shown at 26, sothat the member 18 may be adjusted to anascertained position by means of the screw 15.

Describing the operation of the tool, in setting the teeth of the sawthe gage-plate 9 is first adjusted so that all of the teeth offset thesame length when the tool is operated. Having adjusted the plate 9, thetool is now disposed so as to receive a tooth of the saw and the handles1 and 3 are forced together, so as to clamp firmly against the tooth. Inclamping the tooth between the jaws ofthe tool the projecting endportion of the pressure member 2O is caused to bear against the sideofthe saw, and under certain conditions of use the engagement of thepressure member, as above mentioned, will force the projection 21approximately into alinement with the notch 26 at one side of the recess17. rIhe feed-screw 15 may now be adjusted so that the member 18 willassume a position a certain distance from the notch, according to theset which it is desired to give to the teeth of the saw, and by forcingthe tool downwardly the pressure of the member 20 against the saw willbe gradually relieved until the projection 21 of this member moves intoalinement with the indicating member 18, whereupon the downward movementof the tool is stopped, the necessary pitch having been given to thetooth. The amount of movement of the pressure-plate 20, as indicated bythe member 18, determines the pitch which is given the teeth, and thisenables all of the teeth to be offset exactly the same distance, whichis a very essential feature in a device of this class. It will beunderstood that by adjusting the member 18 the amount of pitch of thesaw-teeth may be regulated in a manner readily apparent to those versedin this art.

Having thus described the invention, what is claimed as new is- 1. In asaw-set, the combination of coacting jaws, a pressure-plate pivoted toone of the jaws and adapted to engage the saw operated upon, and anadjustable indicating member carried by one of the jaws to indicate themovement of the pressure member.

2. In a saw-set, the combination of coacting jaws, a pressure-platepivoted to a side of one of the jaws and adapted to engage the sawoperated upon to indicate the movement of the tool relative thereto, anda movable indicating member adjustably mounted upon the jaw carrying thepressure member.

3. In a saw-set, the combination of coacting jaws, handles for the jaws,a pressure member pivoted to a side of one of the jaws, spring meanscoperating with said member, a feed-screw mounted upon the jaw carryingthe pressure member, and an indicating member adjustable upon saidfeed-screw.

4. In a saw-set, the combinationV of coacting jaws, handles for thejaws, a pressure member pivoted to a side of one of the jaws, springmeans coperating with said member, a feed-screw mounted upon the jawcarrying IOS the pressure member, an indicating member adjustable uponsaid feed-screw, a spring coacting with the indicating member, and aguide member for directing the movement of the pressure member.

5. In a tool of the class described, the combination of relatively fixedand movable jaws, a handle carried by the fixed jaw, a second handlepivoted at one end to the fixed jaw, the movable jaw being provided witha cam, 115 and means carried by the second handle at a point between itsends for engaging the cam of the movable jaw to effect actuation of thelatter.

In testimony whereof I aiifix my signature in I 2O presence ofwitnesses.

HARRY L. JOHNSTON. [1.. sl

Witnesses:

FRANK RICHARDSON, OHAs. G. STURTnvAN'r, HENRY OWENS.

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